The Boeing Starliner astronauts took their first joint spacewalk

This story incorporates reporting from  Bill McEwen, Space.com and CNN on MSN.com.

NASA astronauts Suni Williams and Butch Wilmore, currently stationed aboard the International Space Station (ISS), have successfully conducted a spacewalk as part of their extended mission. Their mission, originally intended for a shorter duration, was prolonged when the Boeing Starliner spacecraft that took them into space was deemed unable to safely return them to Earth.

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Correction: An earlier version of this article misstated the reason the astronauts’ time in space has been extended. It is because the Boeing Starliner spacecraft that took them into space was deemed unable to safely return them to Earth, not to conduct maintenance tasks outside the International Space Station.